Hello,
Indeed, this is a strange problem. If the plugin is installed but not active it works, on the other hand, as soon as I make it active, I have no access to the site. I have to deactivate all the plugins and then reactivate them to get the site working again. I have never encountered this problem when installing another plugin.
Of course, here is a screenshot of the message that appears.
Thanks in advance.
Here is a link to a screenshot of the error in question : https://zupimages.net/up/21/21/qoxi.png